html, body, ul {
  padding: 0;
  margin: 0;
}

ul {
  list-style: none;
}

* {
  box-sizing: border-box;
}

.example {
  width: 200px;
  margin: 0 auto;
  padding-top: 100px;

  .box {
    height: 200px;
    width: 200px;
    background-color: #f96330;
  }

  .btn button {
    margin-top: 20px;
    width: 200px;
    height: 40px;
  } 
}
